/**
 * Copyright ${license.git.copyrightYears} the original author or authors.
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.ibatis.submitted.enum_interface_type_handler;

import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.apache.ibatis.type.BaseTypeHandler;
import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.MappedTypes;

@MappedTypes(HasValue.class)
public class HasValueEnumTypeHandler<E extends Enum<E> & HasValue> extends
        BaseTypeHandler<E> {
    private Class<E> type;
    private final E[] enums;

    public HasValueEnumTypeHandler(Class<E> type) {
        if (type == null)
            throw new IllegalArgumentException("Type argument cannot be null");
        this.type = type;
        this.enums = type.getEnumConstants();
        if (!type.isInterface() && this.enums == null)
            throw new IllegalArgumentException(type.getSimpleName()
                    + " does not represent an enum type.");
    }

    @Override
    public void setNonNullParameter(PreparedStatement ps, int i, E parameter,
                                    JdbcType jdbcType) throws SQLException {
        ps.setInt(i, parameter.getValue());
    }

    @Override
    public E getNullableResult(ResultSet rs, String columnName)
            throws SQLException {
        int value = rs.getInt(columnName);
        if (rs.wasNull()) {
            return null;
        }
        for (E enm : enums) {
            if (value == enm.getValue()) {
                return enm;
            }
        }
        throw new IllegalArgumentException("Cannot convert "
                + value + " to " + type.getSimpleName());
    }

    @Override
    public E getNullableResult(ResultSet rs, int columnIndex)
            throws SQLException {
        int value = rs.getInt(columnIndex);
        if (rs.wasNull()) {
            return null;
        }
        for (E enm : enums) {
            if (value == enm.getValue()) {
                return enm;
            }
        }
        throw new IllegalArgumentException("Cannot convert "
                + value + " to " + type.getSimpleName());
    }

    @Override
    public E getNullableResult(CallableStatement cs, int columnIndex)
            throws SQLException {
        int value = cs.getInt(columnIndex);
        if (cs.wasNull()) {
            return null;
        }
        for (E enm : enums) {
            if (value == enm.getValue()) {
                return enm;
            }
        }
        throw new IllegalArgumentException("Cannot convert "
                + value + " to " + type.getSimpleName());
    }
}
